Solar cycle changes in the morphology of the Venus ionosphere

Details Solar cycle changes in the morphology of the Venus ionosphere Solar cycle changes in the morphology of the Venus ionosphere

Aug 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93.8756k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Aug. 1, 1988, p. 8756-8762.

Physics

24

Ionospheric Ion Density, Molecular Ions, Morphology, Planetary Ionospheres, Solar Cycles, Venus Atmosphere, Ionopause, Oxygen Ions, Pioneer Venus Spacecraft, Plasma Density

Scientific paper

Altitude profiles of median plasma density are presented for the central nightside Venus ionosphere for the solar cycle maximum (SCmax) and minimum (SCmin), constructed from Pioneer Venus retarding-potential-analyzer total ion density data. The curves demonstrate that, between the altitudes of 200 and 2000 km, the nightside ionospheric density during SCmin was smaller, by a factor of 10, than it was during SCmax. This observation, along with the Venera radio occultation measurements at SCmin, support the contention that the Venus SCmin ionosphere is typically confined to an altitude below 250 km at all solar zenith angles (SZAs), with possible exception of an SZA interval near the terminator, and is composed primarily of O2(+).

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